Blow a strawberry phrase
To make a mocking sound or a playful gesture by pressing the tongue and lips together
The player blew a strawberry at the opposing team’s fans after scoring a goal.
She blew a raspberry on the baby’s belly and suddenly he started laughing.
He blew a raspberry at them and left.
To ridicule or make fun of someone or something
This idiom is used for physical or verbal attacks on the English.
To fart
1. To release something or make it begin functioning, operating, or running as fast as possible.
2. To say or do something or allow something to happen with a lot of power, excitement, etc., and without restraint.
3. To fart, particularly blatantly.
The verb "blow" should be conjugated according to its tense.
This expression is from rhyming slang, where raspberry tart means a fart.